Alright lets start again... I would like to have a 150 db daily driver. Forget about competition right now. I drive a 99 ford ranger ext. cab. stock everything. I found a 250 amp alt that will fit. I am going to put that in along with the big three. I would LIKE to get a setup that would get at least close to 150 db... Right now I am looking at an atomic apx 18. Can anyone give some advice on amp(s) and a sub and box. I would like to stick with one sub just for the simplicity. Cab dimensions for box are 18" wide, 45 inches long and 20-25 inches tall. Please help me set up a loud system.